The amount of child support a court will order for any particular case may be different from the amount estimated by the calculator. *The most recent calculator update was in March 2021. At the state level, many states exempt Social Security from taxation, either partially or completely. You can receive the state SSI payment only if you qualify for a federal SSI payment. TurboTax offers a free suite of tax calculators and tools to help save you money all year long. . If you have any doubt about whether your child might qualify for SSI, it's best to contact your local Social Security office for help.